Couldn't figure out how to correct my typo, above, from my Mac computer. Meant to type the abbreviation for cylinder but somehow it came out ply. Some strange interaction between this forum and my computer causes cal to appear when I type the c y and l keys in succession.

I'm glad you corrected the two-ply comment. Thought I was learning a new sophisticated term to impress others with, as in: "Of course a vessel of that size would require a two-ply marine engine."Thanks for saving me the embarrassment.I rather like the robust greenery firming up the roadbed. Looks like he could use a little turf-builder in the curves. The track reminds me of Penn-Central in south Jersey when I was growing up!